Lumen is a unit of measurement used to quantify the amount of visible light emitted by a source. It helps in understanding how bright a light bulb or other lighting devices will appear to the human eye. The higher the lumen rating, the brighter the light. This measurement is essential for choosing appropriate lighting for different spaces, such as homes, offices, and outdoor areas. In the context of lighting, lumens are often compared to watts, which measure energy consumption. While watts indicate how much energy a light source uses, lumens provide a clearer picture of its brightness. This distinction is important for energy efficiency and effective lighting design.